Alarm lock for doors having a key operated magnetic switch control



Nov. 8, 1966 P. M. HAWKINS 3,284,593

ALARM LOOK FOR DOORS HAVING A KEY OPERATED MAGNETIC SWITCH CONTROL Filed April 28, 1965 7 Sheets-Sheet l Ti l.

m q a 9 H Amway;

Nov. 8, 1966 P. M. HAWKINS 3,284,593 ALARM LOCK FOR DOORS HAVING A KEY OPERATED MAGNETIC SWITCH CONTROL Filed April 28, 1965 '7 Sheets-Sheet 2 TILEIJU.

Nov. 8, 1966 P. M. HAWKINS 3,284,593

ALARM LOCK FOR DOORS HAVING A KEY OPERATED MAGNETIC SWITCH CONTROL Filed April 28, 1965 7 Sheets-Sheet 3 Z7. 4 l 1214 T1 q.%

26 i E W 25 44 LL Nov. 8, 1966 P. M. HAWKINS 3,284,593 ALARM LOCK FOR DOORS HAVING A KEY OPERATED MAGNETIC SWITCH CONTROL Filed April 28. 1965 '7 Sheets-Sheet 4 H INVENTOR.

I R904 WAmso/v llqwmvs Nov. 8, 1966 M HAWKINS 3,284,593

P.. ALARM LOOK FOR DOORS HAVING A KEY OPERATED MAGNETIC SWITCH CONTROL INVENTOR. 9M. M90060! Mun vs BY Nov. 8, 1966 HAWKINS 3 P M. ALARM LOCK FOR DOORS HAVING A KEY OPERATED Filed April 28, 1965 MAGNETIC SWITCH CONTROL 7 Sheets-Sheet 6 INVENTOR. Q04 fihw/scwf/nwxms Nov. 8, 1966 P. M. HAWKINS 3,284,593

ALARM LOOK FOR DOORS HAVING A KEY OPERATED MAGNETIC SWITCH CONTROL Filed April 28. 1965 7 SheetsSheet '7 ATTOQWEYS 3,284,593 ALARM LOCK FOR DOORS HAVING A KEY OPERATED MAGNETIC SWITCH CONTROL Paul Maddison Hawkins, Jericho, N.Y., assignor to General Alarm Corporation, New York, N.Y., a corporation of Delaware Filed Apr. 28, 1965, Ser. No. 451,411 25 Claims. (Cl. ZOO-61.64)

This invention relates to alarm loclcs, and more particularly, to improved systems for locking an enclosure and for actuating an alarm upon unauthorizedtampering with a door or the like serving the enclosure.

Heretofore, a number of devices of the foregoing class have been proposed, each incorporating features intended to contribute a certain level of security, while at the same time giving an indication of any unauthorized breach of security. While some of these devices have achieved a degree of commercial success, law enforcement agencies, as well as those skilled in the art, fully appreciate that the known devices do not afford a desirable level of security at a cost that is reasonable and within the means of many homeowners. The high cost of alarm systems of good quality renders them inappropriate for apartment and ofiice buildings or hotels and the like where a great number of separate areas must be individually protected; while'other systems of lesser quality are subject to manipulation by unauthorized persons.

Additionally, the alarms with which I am familiar are operable when the door or closure has actually been opened, and those concerned with security are well aware of the great need for a system wherein the alarm will be actuated before entry is actually achieved.

Accordingly, I have conceived an alarm system that overcomes the foregoing difiiculties and disadvantages and which effectively furnishes an exceedingly high degree of security at a relatively low cost, and I have actually constructed a successfully operating system based upon that concept.

Essentially, I contribute by my invention apparatus for actuating an alarm upon movement of a closure member relative to a stationary mmeber comprising in combination, a magnet mounted on one of the members and means formed of magnetic material supported on the other member adjacent the magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of the magnet when adjacent the means formed of magnetic material and released for movement to a second position when the magnet is rendered ineffective, a switch associated with the carrier and operable to actuate an alarm circuit between operative and inoperative conditions in response to movement of the carrier, and means adapted to prevent the carrier from moving to the second position.

As a feature of my invention, the foregoing combination maybe mounted in mortises formed in the opposed edges of a door rail and jamb with either no exposed part? whatever on either side of the door when the warning device is equipped with an electronic beam trans- 'rnitter, or with the face of the sound producing device alone exposed on the inside of the door, if desired. The unit is thus substantially self-contained, that is, the lock and alarm mechanisms as well as the power supply are all contained within the mortises. I prefer to include in the mortise containing the switch, a power source such as long-life batteries so that the energy supply to the switch cannot be interfered with and no exterior wiring is required. It will be understood that the switch may be used to energize an alarm such as a siren or horn which may be mounted in the same or an adjacent mortise; or it may energize a miniature transmitter which United States Patent Ofiice 3,284,593 Patented Nov. '8, 1966 emits signals to a remote receiver tuned to its frequency and effective to actuate an audio or visual alarm or both, when the proper signals are received.

An important feature of the invention resides in the particular concept of a key operated magnetic switch control by means of which I am able to combine the function of a lock and an alarm into a single operating unit thus permitting automatic setting of the alarm simply by placing the lock into locking position, all with but a single key. Actually, therefore, one of the features of my invention makes the alarm and lock a completely integrated mechanism requiring no additional lock for security purposes and automatically etting the alarm upon the conventional locking of a door or other closure. Thus, the same key operated bolt control, which may be a convention-a1 pin tumbler barrel lock for example, is effective also magnetically to set the alarm circuit when the bolt is thrown to locking position. Means are provided so that when thebolt is retracted by proper rotation of the lock barrel so that the door can be legitimately opened, the alarm circuit remains open. However, should the door be opened other than by rotating the barrel, the magnetic force holding the alarm switch in open position is released and the switch moves to position to close the alarm circuit.

A further important and highly significant aspect of the present invention is a constructural feature whereby means are provided for closing the alarm circuit while the bolt is projected in the event that a would-be intruder attempts to jimmy or force the door or closure. For this purpose, I provide an additional mechanism within the bolt keeper to sense lateral shifting of the bolt due to forces greater than normal forces applied in closing and opening a door or other closure, and such as would be applied by attempted forcing or jimmying of the door or closure. A linkage is associated with the force sensing means and is operable, when appropriate forces are exerted on the door or closure, to deactivate the magnetic force that normally retains the switch open. The switch thus shifts to closed position and the alarm is energized even though the door or closure has not been opened. In effect, therefore, over and above the self-contained alarm and lock combination, the aforementioned mechanism increases the overall effectiveness of the alarm system by actuating a pro-warning alarm before the lock itself is forced or the door or closure opened.

In order to deactivate the switch controlling magnet, I prefer to employ a second magnet the poles of which are normally adjacent to the opposite poles of the first switch controlling magnet so that the magnets tend to attract each other, thus cooperating to maintain the switch open. However, this second magnet is moveable by the keeper linkage to permit the switch to move to closed position. I accomplish this by mounting the second magnet for rotation and biasing it by a spring load to rotate The linkage is arranged normally to prevent rotation of the second magnet by the spring force, but is moveable to an inactive position upon the application of an appropriate force to the door. It will be appreciated that by thus permitting the spring to effect rotation of the second magnet through an arc of 180, its pole positions are reversed and the first switch controlling magnet is not only released, but is actually repelled by the action of the like magnetic poles into switch closing position.

Another important and novel feature of the invention resides in the provision of a three position security thumb latch, as part of the alarm-lock system, operable from the inside of the door or closure. The latch may be positioned in either of three longitudinal positions, in contrast to the conventional one-position thumb latch incorporated in non-alarm locks of which I am aware. In the first or innermost position, the resident deadlocks the bolt so that unauthorized persons may not retract the bolt from outside, even with a key. The resident is thus alforded maximum security even against individuals in possession of a proper key such as a pass key, or lost or stolen keys. In addition, this feature is particularly important to hotel residents since previous tenants could have had duplicate keys made so as to gain access to the rooms they had occupied.

In the second or intermediate position, the resident may use the thumb latch to throw or withdraw the bolt without the need of a key. Provision is made whereby, upon retraction of the bolt by use of the latch in this position, the alarm is not actuated, but is set for operation upon again projecting the bolt to locked position.

In the third or fully withdrawn position, the bolt may not be retracted other than by use of a key. This position thus prevents an intruder from gaining access by breaking or cutting through a door such as a glass, wood or kalamein door, and then reaching in to open the door from the inside.

It will be appreciated that the present alarm device comprises an alarm and locking arrangement which may be placed into active and inactive condition by a sin e authorized operation and which will give a remote or local alarm, or both, upon unauthorized tampering or entry.

There has thus been outlined rather broadly the more important features of the inventionin order that the detailed description thereof that [follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures [for carrying out the several purposes of the invention. It is important, therefore, that the claims be regarded as including such equivalent construction as do not depart from the spirit and scope of the invention.

A specific embodiment of the invention has been chosen for purposes of illustration and description, and is shown in the accompanying drawings, forming a part of the specification, wherein:

FIG. 1 is an elevational view of the inner side of a conventional glass and panel door utilizing an alarm systern according to the present invention;

FIG. 2 is an elevational detail view, partly broken away, illustrating details of the integrated alarm-lock system in mounted disposition with the bolt in projected position; i

' FIG. 3 is a view similar to FIG. 2 but illustrating the system with the bolt retracted by the key actuated lock barrel;

FIG. 4 is a cross-sectional view taken along the lines 4 4 of FIG. 2 and showing the three position latch in the first or innermost position;

" FIG; 5 is a view similar to FIG. 4 but with the latch in the second or intermediate position;

FIG. 6 is similar to FIGS. 4 and 5 but with the latch in the third or fully withdrawn position;

FIG. 7 is a perspective detail view illustrating the relationship of the latch to one of its associated parts; FIG. 8 is a -cross -sectional view taken along the lines 8-'8 of FIG. 5;

FIG. 9 is a cross-sectional view taken along the lines 99 of FIG. 6;

FIG. 10 is a cross-sectional view taken along the lines 1010 of FIG. 3 illustrating the'means for closing the alarm circuit while the bolt is projected as when an attempt is made to force the door;

, 4 FIG. 11 is a view similar to FIG. 10, but showing the parts in another position;

FIG. 12 is a perspective phantom view illustrating the mechanism of FIGS. 10 and 11 with the alarm switch in open position;

FIG. 13 is similar to FIG. 12 but illustrates the parts in the position they assume when the door is forced and the switch is shifted to open position;

FIG. 14 is a cross-sectional view taken along the lines 1414 of FIG. 3;

FIG. 15 is a schematic view of an alarm circuit with the switch closed;

FIG. 16 is a view similar to FIGS. 2 and 3 but illustrating the alarm system of the present invention'combined in a single casing with a conventional manually operable bolt locking and operating mechanism, again showing the integrated casing of the bolt keeper prewarning mechanism;

FIG. 17 is similar to FIG. 12 but illustrates a further embodiment of that feature of the invention;

FIG. 18 is similar to FIG. 17 but illustrates the parts in the position they assume when the door is forced and the switch is shifted to open position;

FIG. 19 is an elevational view of the structure illustrated in FIGS. 17 and 18;

FIG. 20 is a cross-sectional view taken along the lines 2020 of FIG. 19;

FIG. 21 is a perspective detail view of parts of the switch of FIGS. 17 to 20; and

FIGS. 22 and 23 are cross-sectional views taken along lines 22 of FIG. 20 and showing the parts in normal and actuated positions, respectively.

Referring now to the drawings, and more particularly to FIG. 1 thereof, there is viewed from the inside a closure member in the form of a conventional door 10 mounted to swing between open and closed positions in respect of a jamb 11. A casing 12, the outline of which is shown in broken lines, is positioned in a mortise cut in the edge of the door and the grid 14 of an audible signal alarm device is shown mounted in the door rail above the casing 12. At this point, it should be understood that the audible sound device could be located on any other part of the door, and that, furthermore, in the event that the audible sound device is replaced by a miniature transmitter 13 for sending a signal to a remote receiver (not shown), no parts whatever of the alarm components would be exposed either on the outside or inside face of the door.

Turning now to FIGS. 2 and 3, the alarm actuating and lock apparatus are shown in detail with the bolt in projected and retracted positions, respectively. The casing 12 is held in position inthe mortise by means of a pair of wood screws 15 passing through a non-magnetic face plate 16 and threaded into the door in the usual way. A non-magnetic keeper 17 is similarly mortised into the jarnb 11 opposite the casing 12 to receive the bolt 19 when the latter is projected from the casing as in FIG. 2.

The bolt 19 is integrally connected to a plate 20 which is guided for reciprocal movement by members 21 and 22 integral with the casing, the latter member 22 extending into a recess 24 formed in the plate 20 for that purpose.

The bolt 19 and its integral plate 20 are reciprocated by the action of a bolt actuating lever 25 which is supported for pivotal movement on a stud formed on the rear surface of the casing. While the stud itself is not shown in FIGS. 2 or 3, it will be more clearly defined hereinafter; meanwhile, it is suflicient for present purposes to realize that the axis of rotation of the lever 25 passes through the center of a square opening 26 formed in the right hand side of the lever, as viewed in. FIGS. 2 and 3.

The lever 25 has a pin 27 at the left extremity, as

' viewed, which pin extends into a slot 28 in the plate 20 tween its extreme positions as the lever is rocked about its pivot. A fiat spring 23 guides movement of the lever 25 and locks lever 25 in either the bolt retracted or bolt extended position.

As viewed in FIGS. 2 and 3, means are provided in the form of a lock cylinder 29 which may be a double cylinder key actuated from either side of the door or which may be operable only from the outside of the door, a latch, about which more will later be said being provided on the inside. In any case, the cylinder 29 has a conventional rotatable barrel which is equipped with a tongue 30 that moves annularly with the barrel. As shown in FIG. 2, the lever 25 is formed with two upwardly extending fingers31, 32 that define a U-shaped recess into which the tongue 30 extends when the bolt is projected. When the lock barrel is rotated counterclockwise as viewed in FIG. 3, the tongue 30 engages the finger 32. and rocks the lever 25 clockwise wherefore the pin 27 acting in the slot 28 in plate 20 earns the plate and bolt 19 into retracted position. The barrel is also effective to project the bolt when rotated clockwise in which case the tongue 30 engages the finger 31 and rocks the lever 25 counterclockwise, as viewed. It should be noted that parts 25, 19, 23 and 29 are conventional and similar to those used in the operation of a number of non-alarm locks, and that no claim is made herein in respect of these parts, per se.

Turning now to the upper portion of the casing there is shown an alarm circuit (illustrated schematically in FIG. comprising, a pair of batteries 34 for energizing the alarm 14 or transmitter 13 through a mercury switch 35 supported on a carrier 36 that is mounted on the casing for movement about a pivot 37 between positions to close and open the switch 35. The carrier 36 also carries a magnet 39 shown as a horse-shoe magnet. As indicated, the magnet 39, switch 35 and carrier 36 are so arranged that when the magnet abuts the face plate 16, the mercury switch is open, whereas, when the carrier pivots to the right, as viewed and as shown in phantom in FIG. 2, the switch is closed to actuate the alarm 14, or transmitter. The weight and balance distribution of these parts is such that the carrier tends to fall by gravity to switch closing position; but the magnet is strong enough to overcome this tendency when adjacent a suitable magnetic element. Thus, it will be appreciated that by placing a piece of magnetic material such as steel in the keeper 17 opposite the magnet 39, the magnet will maintain the switch open when the door is closed and the magnet is shifted to the position shown in solid lines in FIG. 2. If, however, the door is forced, as it moves away from the jamb, the steel piece will move out of the magnetic field and the magnet, carrier and switch will rock by gravity to switch closing position, thus to actuate the alarm.

It is of course not desired that the alarm will be energized when the door is opened by an authorized person, wherefore means must be provided to prevent the switch from closing the alarm circuit when an authorized person opens the door as by proper use of a key in the lock cylinder 29. To this end, there is provided a switch control pin 40 supported in a sleeve 41 for vertical axial movement. As shown, the pin extends below the bottom and above the top of the sleeve and at its upper end, the pin is enlarged to a width greater than that of the sleeve so the pin will not drop out of the sleeve. The pin 40 is so located in the casing that when in its lowermost position (FIG. 2) it is sufliciently clear of the carrier 36 as to permit same to pivot to switch closing position. However, when the pin is raised to its uppermost position (FIG. 3) its head engages the underside of the carrier and prevents it from shifting to switch closing position so that the alarm will not be energized regardless of the position of the door. To raise the pin 40 when the bolt is retracted by an authorized person, there is provided an enlarged head on the pin 27 at the end of the lever 25. As the lever is rotated clockwise to retract the bolt 19 the pin 27 engages the bottom of pin 40 and raises it up. through sleeve 41 to the position shown in FIG. 3 so that the carrier 36 cannot rock to switch closing position as the door is swung open and the magnet 39 moves away from the keeper. When the door is closed, the magnet again comes into position opposite the keeper and is attracted to the magnetic member there mounted. Thus, the bolt may be projected to locking position by action of the lock cylinder allowing the pin 40 to drop and the switch remains in open position although the alarm circuit is again set.

It will be recalled that reference was made to a three position security latch operable from the inner side of the door. Such a latch is designated generally by the number 42, and for an understanding of the structure and function of this latch, reference is bad to FIGS. 4 to 9.

In FIG. 4, the latch 42 is shown in its first or innermost position according to which a square shank section 44 of the latch is positioned in the square hole 26 of the lever 25 which it will be remembered is supported for pivotal movement on a stud 43 on the casing. A pin 45 integral with the latch sits in vertical recess 46 (FIGS. 4 and 7) formed in the casing 12 so that the latch, and therefore the lever 25, cannot be rotated. In this position, therefore, the bolt cannot be retracted, even by use of a proper key in the lock cylinder 29. This feature prevents access by persons who may have found or duplicated the correct key, or who try to pick the look. Incidentally, although a double cylinder 29 is shown in FIGS. 4 to 6, it will be appreciated that a single cylinder operable from the exterior only may be employed.

In FIGS. 5 and 8, the latch 42 is shown in its second or intermediate position wherein its square shank section 44 still fits partially into the square hole 26 in lever 25, but the pin 45 is free of the recess 46. In this position, the latch, and with it the lever 25, may be pivoted about the latch axis so that the bolt 19 may be projected and retracted by either the latch 42 or the lock cylinder 29. In either case the alarm circuit is set when the bolt is projected and the switch 35 is supported in open position when the bolt is retracted.

In FIGS. 6, 7 and 9, the latch is shown in its third or outermost position wherein the shank section 44 is fully withdrawn from the hole 26 so the latch has no control of the lever 25. The lock cylinder may, nevertheless, be used to retract and project the bolt when the latch 42 is in this third position. Here, it is important to note that when the latch is withdrawn to its third position and the bolt is projected by the lock cylinder, the square hole 26 will have rotated 45 degrees relative to the square shank section 44 so that the latch cannot be shifted to its second or first positions. It is therefore impossible to obtain control of the bolt by means of the latch so Ion-g as the bolt is projected; however, the lock cylinder may be used to retract the bolt. Thus, only an individual with a key can open the door, and even if a potential intruder breaks a door panel or glass pane, he cannot reach in and use the latch to retract to bolt. Rotation of the latch while in this position may be prevented by providing a pin 47 and cooperating recess 49 (FIG. 7) formed on the inside of the casing. The latch may be shifted to its first or second positions when the bolt is retracted by the lock cylinder returning lever 25 to its original position.

It has already been noted that the present system includes means for activating the alarm while the bolt is projected and the door is closed, in the event that wouldbe intruder attempts to force or jimmy the door. The means for achieving this objective are shown in FIGS. 10 to 14 wherein the keeper 17 is shown as formed to support a circular magnet 5t in lieu of the magnetic member referred to before. Normally, as shown in FIG. 12, the north and south poles of the circular or keeper magnet respectively oppose the south and north poles of the magnet 39 in the casing. One end of a torsion spring 51 engages a stud 52 while the other end engages the magnet 50, the spring biasing the magnet to rotate 180 degrees. Under normal circumstances, such rotation is prevented by a detent 54 engaging a shoulder on the magnet. The detent is formed on the end of a link 55 pivoted at 56 and having an arm 57 that engages one side of the bolt 19 when the latter is projected to locking position. A second arm 59 engages the other side of the projected bolt and may be pivoted to the link 55 by another link 60, and pivoted to the keeper as at 58. Each of the arms 57 and 59 is biased inwardly by spring 61 carried in the keeper walls. The springs are selected to load the door to withstand a predetermined force before shifting sufficiently to rock the arms 57 and 59 to withdraw the detent 54 from the magnet. The arms 57 and 59 may be equipped with pads 62 to guide and center the bolt 19 as it moves to projected position. In the event that a potential intruder applies to the door a force in excess of that allowed by the springs 61, as by a cr'owbar or jimmy, the linkage will be actuated by lateral movement of the bolt and the detent 54 will disengage from the magnet 50 allowing the torsion spring 51 to rotate the magnet 180.

degrees so that its north and south poles are respectively.

positioned opposite the like poles of the magnet 39. Thus, the magnet 39 is not merely released, but is positively repelled to switch closing position (FIG. 13).

Turning now to FIGS. 17 to 23, there is shown a switch actuating mechanism representing a preferred embodiment of the means for closing the alarm circuit while the bolt is projected as when an attempt is made to force the door. In this embodiment, I utilize the same circular magnet 50 and torsion spring 51 as before; and the switch 35, carrier 36 and magnet 39 are all mounted in the casing 12 to pivot about the pin 37 precisely as described in connection with the previous embodiment to actuate the alarm circuit.

As shown in FIGS. 17 and 18, the keeper for the bolt 19 is actually a housing 70 supported for pivotal movement about the axis of pins 71 and 72 integral therewith and journalled in suitable bores in keeper blocks 74 and 75, respectively, shown in phantom for clarity. The housing 70 is open at its face to receive the bolt 19 when same is projected to locked position, as shown in FIGS. 17, 18, 22 and 23, and a flat spring 76 has its ends fitted into suitable slots in the keeper blocks 74 and 75 in a manner to cause same to bulge inwardly towards the housing 70, thus to bias same against pivotal movement about the axes of the pins 71 and 72. As in the case of the springs 61 (FIGS. 13), the spring '76 is selected to prevent movement of the housing 70 by the bolt 19 under normal loads. Abnormal loads, however, will shift the housing 70 and will effect rotation of the pins 71 and 72 that are integral with the housing.

As already mentioned, the magnet 50 and spring 51 are the same as in the embodiment of FIGS. 1013, one end of the spring engaging a stud 52 while the other end engages the magnet 50 to bias the latter to rotate 180 degrees, such rotation being normally prevented by a detent which in the present embodiment is illustrate-d as a pin 77 projecting radially from the top of the pin 72 and engaging a shoulder on the magnet. The pin and shoulder are so arranged that upon a predetermined angular movement of the housing 70 and pin 72 (FIG. 23) as would occur upon an attempt to force or jimmy the door, the pin 77 disengages the shoulder on the magnet and allows the torsion spring 51 to rotate the magnet 50 through an arc of 180 degrees, thus reversing the positions of its poles and positioning same opposite like poles of the magnet 39. The magnet 39 is thus again not merely released to pivot by gravity about pin 37, but is actually and positively repelled to alarm switch closing position (FIG. 18).

It will be appreciated by those persons skilled in the art that the foregoing aspects of my invention constitute a high level of security in thatthe alarm is actuated pendently of knob controlled bolts, but as shown in FIG. 16, the system may readily be combined with a conventional apparatus of that type. The casing 80 is similar to casing 12 already described but is somewhat larger to hold the additional part incident to knob control, and the keeper 81 includes provision for an additional knob controlled bolt 82. The knob (not shown) is mounted on a knob shank 84 rotation of which serves to rock the lever 85 to the right as viewed about its pivot 86 by means of the rocker 87. Such movement of the lever 7 0 withdraws the bolt 82 through the :rod 89 against the action of the spring 90. The conventional push buttons 91 and 92 may be provided to lock and unlock the knob shank 82 although, if desired, they may be dispensed with in the present construction. Locking is effected by depressing the butt-on 91 so that the shank 84 cannot be rotated. The shank is released by depressing the button 92 which shifts a pivot bar 96 to withdraw the shaft 94 from the slot 95.

The bolt 82 may also be withdrawn, along with bolt 19, by means of the lock cylinder 29 or the latch 42 (not shown in FIG. 16). Thus rotation of-the cylinder effects withdrawal of the plate 20 through the action of the lever 25 and also pivots a lat-ch release 97 which engages a release arm 99 and shifts same, and with it the link 1011 and lever 85 to withdraw the latch 82 through movement of the rod 89 against the force of the spring 90.

The bolt 19 is protected against the action of a saw by means of a hollow zone (FIG. 2) in which is freely disposed a floating hardened steel bar or pin 106. Should an attempt be made to saw through the bolt, when the saw teeth engage the bar 106, they do not cut into the latter, but cause the same merely to rotate back and forth in the hollow zone 105.

Since an intruder sometimes gains entry by using a special wrench to grip the bevelled edge of the lock cylinder and unscrewing the entire cylinder, provision is here made to avoid this possibility. Thus, as best shown in FIGS. 4 to 6, the cylinders 29 are equipped with bevelled cylinder rings formed of case hardened steel and disposed for free rotation about the cylinder so that its rotation will not cause removal of the cylinder.

From the foregoing description, it will be seen that I contribute an alarm system embodying the combination of an alarm and dead bolt wherein the alarm is set by the same operation that sets the lock and that eifectively affords a high degree of protection because of its several novel security features, all at a relatively low cost, and in compact form. It will also be seen that the present system may be used independently of or in combination with a conventional knob operated latch.

I believe that the construction and operation of my novel alarm lock will now be understood and that the advantages of my invention will be fully appreciated by those persons skilled in the art.

I claim:

1. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a magnet mounted on one of said members and means formed of magnetic material supported on the other of said members adjacent said magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnet when adjacent said means formed of magnetic material and released for movement to a second position when said means formed of magnetic material is beyond the field of attraction of said magnet due to relative movement therebetween, a switch associated with said carrier and operable to actuate an alarm circuit between operative and inoperative conditions is response to said movement of the carrier, and

.bolt actuating lever to means adapted to prevent said carrier from moving to said second position.

2. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a magnet mounted on one of said members and means formed of magnetic material supported on the other of said members adjacent said magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnet when adjacent said means formed of magnetic material and released for movement to a second position when said means formed of magnetic material is beyond the field of attraction of said magnet due to relative movement therebetween, a switch associated with said carrier and operable to actuate an alarm circuit between operative and inoperative conditions in response to said movement of the carrier, means adapted to prevent said carrier from moving to said second position, and means for rendering said last mentioned means ineffective.

3. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a bolt, means operable to shift said bolt between locking and unlocking positions relative to said members, a magnet mounted on one of said members and means formed of magnetic material supported on the other of said members adjacent said magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnet when adjacent said means formed of magnetic material and released for movement to a second position when said means formed of magnetic material is beyond the field of attraction of said magnet due to relative movement therebetween, a switch associated with said carrier and operable to actuate an alarm circuit between operative and inoperative conditions in response to said movement of the carrier, and means operable upon movement of said bolt to unlocking position to prevent said carrier from moving to said second position.

4. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a magnet mounted on one of said members and means formed of magnetic material supported on the other of said members adjacent said magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnet when adjacent said means formed of magnetic material and released for movement to a second position when said magnet is rendered ineffective, a switch associated with said carrier and operable to actuate an alarm circuit between operative and inoperative conditions in response to said movement of the carrier, and means adapted to prevent said carrier from moving to said second position.

5. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a bolt, means including a bolt actuating lever operable to shift said bolt between locking and unlocking position relative to said members, a magnet mounted on one of said members and means formed of magnetic material supported on the other of said members adjacent said magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnet when adjacent said means formed of magnetic material and released for pivotal movement to a second position when said magnet is rendered ineifective, a switch associated with said carrier and operable to actuate an alarm circuit between operative and inoperative conditions in response to said pivotal movement of the carrier, and a switch control member moveable by said prevent said carrier from pivoting to said second position when said bolt is retracted.

6. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members and a second magnet supported on the other of said members adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in position by the action of said magnets when said closure member is in closed position relative to said stationary member and released for movement to a second position when said magnets are moved away from one another, a switch associated with said carrier and operable to actuate an alarm circuit between operative and inoperative conditions in response to said movement of the carrier, and a switch control member operable to prevent said carrier from pivoting to said second position.

7. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnets and released for movement to a second position when said magnets are rendered ineffective to hold said carrier, a switch associated with said carrier and operable to actuate an alarm circuit in response to said movement of said carrier, said second magnet being mounted normally to attract said first magnet but being moveable to a position to repel said first magnet, means urging said second magnet into position to repel said first magnet, restraining means operable to render said last mentioned means ineffective, and sensing means responsive to lateral movement of said closure member to deactivate said restraining means.

8. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnets and released for movement to a second position when, said magnets are rendered ineffective to hold said carrier, a switch as soc-iated with said carrier and operable to actuate an alarm circuit in response to said movement of said car- :rier, said second magnet being mounted normally to attract said first magnet but being moveable to a position to repel said first magnet, a torsion spring urging said second magnet into position to repel said first magnet, a detent engaging said second magnet to render said last mentioned means ineffective, and sensing means responsive to lateral movement of said closure member to disengage said detent and said second magnet.

9. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, '3. carrier mounted so as to be held in one position by the action of said magnets and released for movement to a second position 'When said magnets are rendered ineffective to hold said carrier, a switch associated with said carrier and operable to actuate an alarm circuit in response to said movement or said carrier, said second magnet being mounted normally to attract said first magnet but being moveable to a position to repel said first magnet, a torsion spring urging said second magnet into position to repel said first magnet, a detent engaging said second magnet to render said last mentioned means inefiective, sensing means responsive to lateral movement of said closure member to disengage said detent and said second magnet, and spring means loading said closure member to withstand a preselected load before moving laterally to activate said sensing means.

10. In apparatusfor actuating an alarm upon movement of a closure member relative to a stationary memher, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnets and released for movement to a second position when said magnets are rendered inefiective to hold said carrier, a switch associated with said carrier and operable to actuate an alarm circuit in response to said movement of said carrier, said second magnet being mounted normally to attract said first magnet but being moveable to a position to repel 'sa-id first magnet, means urging said second magnet into position to repel said first magnet, a detent engagingsaid second magnet to render said last mentioned means ineffective, and sensing means responsive to lateral movement of said closure member to disengage said detent and said second magnet, said sensing means comprising a pair of arms each mounted for pivotal movement and disposed to embrace a bolt between them when said bolt is projected into said keeper, said detent shitting to disengaging position upon movement of either of said arms a predetermined distance due to lateral movement of said bolt.

- 11. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of sai-dmagnets and released for movement to a second position when said magnets are rendered ineffective to hold said carrier, a switch associated with said carrier and operable to actuate an alarm circuit in response to said movement of said carrier, said second magnet being mounted normally to attract said first magnet but being moveable to a position to repel said first magnet, means urging said second margnet into position to repel said first magnet, a detent engaging said second magnet to render said last mentioned means ineifective, sensing means responsive to lateral movement of said closure member to disengage said detent and said second magnet, said sensing means comprising a pair of arms each mounted for pivotal movement and disposed to embrace a bolt between them when said bolt is projected into said keeper, said detent shifting to disengaging position upon movement of eitherof said arms a predetermined distance due to lateral movement of said bolt, and spring means loading said closure member to withstand a preselected load before moving laterally to activate said sensing means.

12. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnets and released for movement to a second .position when said magnets are rendered ineffective to hold said carrier, a switch associated with said carrier and operable to actuate an alarm circuit in response to said move-ment of said carrier, said second magnet being mounted normally with its north and south poles respectively opposite the south and north poles of said first magnet to attract same but being rotatable through an arc of 180 degrees to a position to repel said first magnet, means urging said second magnet into position to repel said first magnet, restraining means operable to render said last mentioned means ineffective, sensing means responsive to lateral movement of said closure member to deactivate said restraining means, and means loading said closure member to withstand a preselected load before moving laterally to activate said sensing means.

13. In a construction for locking and unlocking a closure member relative to a stationary member, a bolt mounted in one of said members for reciprocating movement between locking and unlocking position, a bolt actuating lever, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, a rotatably mounted latch manually operable from the other side of said member, said latch being shiftable axially between a first position and a second position, said latch operably engaging said lever in both positions, means preventing rotary movement of said latch from either side of said members and thus of said bolt actuating lever when said latch is in said first position, said last mentioned means being ineffective when said latch is shifted to said second position whereby said bolt may be actuated by said lock cylinder or by rotary movement of said latch.

14. In a construction for locking and unlocking a closure member relative to a stationary member, a casing mounted in one of said members, a bolt mounted in said casing tor reciprocating movement between locking and unlocking position, a bolt actuating lever, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, a rotatably mounted latch manually operable from the other side of said member, said latch being shiftable axially between a first position and a second position, said latch operably engaging said lever in both positions, cooperating detent elements on said casing and said latch preventing rotary movement of said latch and thus of said bolt actuating lever when said latch is in said first position, said last mentioned means being inefiective when said latch is shifted to said second position whereby said bolt may be actuated by said lock cylinder or by rotary movement of said latch.

15. A construction according to claim 14 further characterized in that said detent elements comprise a recess formed in said casing and a pin extending radially of said latch and entering said recess when said latch is in said first position. '16. In a construction for locking and unlocking a closure member relative to a stationary member, a bolt mounted in one of said members for reciprocating movement between locking and unlocking position, a bolt actuating lever, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, a rotatably mounted latch manually operable from the other side of said member, said latch being shiftable axially between a first position and a second position, said latch operab'ly engaging said lever in said first position whereby said-bolt may be actuated by said lock cylinder or by rotary movement of said latch, said latc'h moving out of operable engagement with said lever in said second position, means cooperating with said latch to prevent rotation thereof when in said second position, and means preventing'movement of said latch from said second position into operable engagement with said lever when said bolt is in projected position.

17. In a construction for locking and unlocking a closure member relative to a stationary member, a casing mounted in one of said members, a bolt mounted in said casing for reciprocating movement between locking and unlocking position, a bolt actuating lever, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, a rotatably mounted latch manually operable from the other side of said member, said latch being shiftable axially between a first position and a second position, said latch operably engaging said lever in said first position whereby said bolt may be actuated by said lock cylinder or by rotary movement of said latch, said latch moving out of operable engagement with said lever in said second position, cooperating elements on said casing and latch preventing said latch from shifting axially to said first position when said bolt is in locking position, means cooperating with said latch to prevent rotation thereof when in said second position, and means preventing movement of said latch from said second position into operable engagement vw'th said lever when said bolt is in projected position.

18. In a construction for locking and unlocking a closure member relative to a stationary member, a bolt mounted in one of said members for reciprocating movement between locking and unlocking position, a bolt actuating lever formed with an opening, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, and a rotatably mounted latch manually operable from the other side of said member, said latc'h being shiftable axially between a first position and a second position, said latch having a shank section adapted operably to engage said lever opening in said first posit-ion, whereby said bolt may be actuated by said lock cylinder or by rotary movement of said latch and to move out of said lever opening when in said second position, said shank section and lever opening being contoured to prevent said shank section entering said opening from said second position when said lever is shifted to bolt projecting position.

19. In a construction for locking and unlocking a closure member relative to a stationary member, a bolt mounted in one of said members for reciprocating movement between locking and unlocking position, a bolt actuating lever, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, and a rotatably mounted latch manually operable from the other side of said member, said latoh being shiftable axially between first, second and third positions and operably engaging said lever when in said first and second positions, means preventing rotary movement of said latch from either side of said members and thus of said bolt actuating lever when said latch is in said first position, said last mentioned means being ineffective 'When said 'latch is shifted to said second position whereby said bolt may be actuated by said lock cylinder or by rotary movement of said latch, said latch being out of operable engagement with said bolt actuating lever when in said third position.

20. In a construction for locking and unlocking a closure member relative to a stationary member, a bolt mounted in one of said members for reciprocating movement between locking and unlocking position, a bolt actuating lever, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, and a rotatably mounted latch manually operable from the other side of said member, said latch being shiftable axially between first, second and third positions and operably engaging said lever when in said first and second positions, means preventing rotary movement of said latch and thus of said bolt actuating lever when said lat-ch is in said first position, said last mentioned means being ineffective when said latch is shifted to said second position whereby said bolt may be actuated 'by said lock cylinder or by rotary movement of said latch, said latch being out of operable engagement with said bolt actuating lever when in said third position, and means preventing movement of said latch from said third position into operable engagement with said bolt actuating lever when said bolt is in projected position. 1

21. In a construction for locking and unlocking a closure member relative to a stationary member, a bolt mounted in one of said members for reciprocating movement between locking and unlocking position, a bolt actuating lever formed with an opening, a lock cylinder operable from one side of the one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, and a rotatably mounted latch manually operable from the other side of said member, said latch being shiftable axially between first, second and third positions and formed with a shank section operably engaging said lever opening when in said first and second positions, means preventing rotary movement of said latch and thus of said bolt actuating lever when said latch is in said first position, said last mentioned means being ineffective when said latch is shifted to said second position whereby said bolt may be actuated by said lock cylinder or by rotary movement of said latch, said latch being out of operable engagement with said bolt actuating lever when in said third position, said shank section and lever opening being contoured to prevent said shank section entering said opening from said third position when said lever is shifted to bolt projecting position.

22. In a construction for locking and unlocking a do sure member relative to a stationary member, a casing mounted in one of said members, a bolt mounted in said casing for reciprocating movement between locking and unlocking position, a bolt actuating lever, a lock cylinder operable from one side of one of said members to shift said bolt actuating lever between bolt projecting and retracting positions, and a rotatably mounted latch manually operable from the other side of said member, said latch being shiftable axially between first, sec-0nd and third positions and operably engaging said lever when in said first and second positions, means preventing rotary movement of said latch and thus of said bolt actuating lever when said latch is in said first position, said last mentioned means being ineffective when said latch is shifted to said second position whereby said bolt may be actuated by said lock cylinder or by rotary movement of said latch, said latch being out of operable engagement with said bolt actuating lever when in said third position, and cooperating elements on said casing and latch preventing said latch from shifting axially to said third position when said bolt is in locking position.

23. In a construction for locking and unlocking a closure member relative to a stationary member, keeper means in one of said members and a bolt mounted in the other of said members for movement between projected and retracted positions relative to said keeper means, said bolt being formed with an internal fully enclosed hollow zone positioned to overextend the space between the closure and stationary members when the bolt is projected, and a hardened pin floating freely Within said hollow zone.

24. In apparatus for actuating an alarm upon movement of a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnets and released for movement to a second position when said magnets are rendered ineffective to hold said carrier, a switch associated with said carrier and operable to actuate an alarm circuit in response to said movement of said carrier, said second magnet being mounted normally to attract said first magnet but being moveable to a position to repel said first magnet, means urging said second magnet into position to repel said first magnet, a detent engaging said second magnet to render said last mentioned means ineffective, and sensing means responsive to lateral movement of said closure member to disengage said detent and said second magnet, said sensing means comprising a housing adapted to receive a bolt, means mounting said housing for movement upon lateral movement of the bolt, means biasing said housing against movement, said detent means shifting to disengage said second magnet upon movement of said housing a predetermined distance.

25. In apparatus for actuating an alarm upon movement. of -a closure member relative to a stationary member, the combination which comprises, a first magnet mounted on one of said members, keeper means mounted in the other of said members and including a second magnet adjacent said first magnet when the closure member is in closed position, a carrier mounted so as to be held in one position by the action of said magnets and released for movement to a second position when said magnets are rendered ineffective to hold said carrier, a switch associated with said carrier and operable to actuate an alarm circuit in response to said movement of said carrier, said second magnet being mounted normally to attract said first magnet but being moveable to -a position to repel said first magnet, means urging said second magnet into position to repel said first magnet, a detent engaging said second magnet to render said last mentioned References Cited by the Examiner UNITED STATES PATENTS 1,112,316 9/1914 Percival 200-6144 2,683,053 7/1954 Russell et -al 200-336 2,7 02,204 2/ 1955 Collier 292-169 3,212,308 Eads 70416 20 BERNARD A. GILHEANY, Primary Examiner.

I. J. BAKER, Assistant Examiner. 

1. IN APPARATUS FOR ACTUATING AN ALARM UPON MOVEMENT OF A CLOSURE MEMBER RELATIVE TO A STATIONARY MEMBER, THE COMBINATION WHICH COMPRISES, A MAGNET MOUNTED ON ONE OF SAID MEMBERS AND MEANS FORMED OF MAGNETIC MATERIAL SUPPORTED ON THE OTHER OF SAID MEMBERS ADJACENT SAID MAGNET WHEN THE CLOSURE MEMBER IS IN CLOSED POSITION, A CARRIER MOUNTED SO AS TO BE HELD IN ONE POSITION BY THE ACTION OF SAID MAGNET WHEN ADJACENT SAID MEANS FORMED OF MAGNETIC MATERIAL AND RELEASED FOR MOVEMENT TO A SECOND POSITION WHEN SAID MEANS FORMED OF MAGNETIC MATERIAL IS BEYOND THE FIELD OF ATTRACTION OF SAID MAGNET DUE TO RELATIVE MOVEMENT THEREBETWEEN, A SWITCH ASSOCIATED WITH SAID CARRIER AND OPERABLE TO ACTUATE AN ALARM CIRCUIT BETWEEN OPERATIVE AND INOPERATIVE CONDITIONS IS RESPONSE TO SAID MOVEMENT OF THE CARRIER, AND 